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Discontinued Operations (Details2) - Discontinued Operations [Member] - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues $ 229.1 $ 260.8 $ 248.9
Operating costs and expenses (1) 223.3 208.0 209.3
Interest income (expense) 0.1 0.1 0.1
Gain (loss) on sale 454.0    
Earnings (loss) before income taxes 459.9 52.9 39.7
Provision (benefit) for income taxes 180.8 21.8 13.5
Earnings (loss) from discontinued operations, net of tax 279.1 31.1 26.2
ED Tech [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues 217.4 246.4 226.1
Operating costs and expenses (1) 208.8 [1] 193.0 [2] 180.6 [3]
Interest income (expense) 0.0 0.0 0.0
Gain (loss) on sale 454.0    
Earnings (loss) before income taxes 462.6 53.4 45.5
Provision (benefit) for income taxes 181.8 22.0 15.5
Earnings (loss) from discontinued operations, net of tax 280.8 31.4 30.0
Unabsorbed overhead 15.8 16.2 17.4
All Other [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues 11.7 14.4 22.8
Operating costs and expenses (1) 14.5 15.0 28.7
Interest income (expense) 0.1 0.1 0.1
Gain (loss) on sale 0.0    
Earnings (loss) before income taxes (2.7) (0.5) (5.8)
Provision (benefit) for income taxes (1.0) (0.2) (2.0)
Earnings (loss) from discontinued operations, net of tax $ (1.7) $ (0.3) $ (3.8)
[1] Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $15.8.
[2] Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $16.2.
[3] Operating costs and expenses included costs related to unabsorbed overhead burden associated with the former educational technology and services business of $17.4.